Weighing-scale.



S. G. CRANE.

WElGHING SCALE.

APPUCATION mm 0:12.21. ma

Patented Dec. 17, 1918.

2 SHEETS-SHEET S. G. CRANE.

wmnms some.

Patented Dec. 17. 1918.

2 SHEETS-SHEET 2A APFLICATIOH FILED DEC.3. 19H.

. Fig. 1 lookin SAMUEL momma, OF TOLEDO, OHIO, ASSIGNOR T0 TOLEDO SCALE COMPANY, OF

TOLEDO, OHIO, A CORPORATION OF NEW JERSEY.

wmonmo-scatn.

Specification of Letters Patent.

Patented Doc. 17, 191.8.

1 Application filed December 3, 1913. Serial No. 804,505.

To all whom it may concern:

Be it known that I, SAMUEL G. CRANE a citizen of the UnitcdStates, residin at '10 ledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in-Weighing-Scales, of .which the following is a specification,

' My invention relates more particularlyto that class of beamsscales in which the poise for counterbalancing or ofl'setting the load in the scale pan is automatically fed along the beam until equilibrium is reestablished.

Heretofore it has been proposed to mount am, by which the position of the poise is controlled, constructions not only impose ex-v electrical Iapparatus upon the but such cessiveload upon the scale beam and its knife edges but present difliculties in the way of providing for the proper-electrical connections, the precise nature of WlllCh it is not necessary here to consider. In the scale which forms the subject-matter of this application these difficulties are avoided by mounting the electrical apparatus direct y upon the base of the scale and providing suitable mechanical connections with the poise whereby the latter maybe automatically adjusted.

In the accompanying drawings,-I have illustrated, and in thefollowing specification described in detail, a preferred form of scale embodyin my invention, but it is to beunderstood t at the" specific disclosure is for the purpose of exemplification only and that the scope of the invention .is setforth in the following claims in which I have endeavored to-distinguish it from the prior art so far as known to me without, however, relinquishing;- or abandoning any portion or feature thereof.

In the drawings Figurel is aside elevation of the scale w ich I have chosen to exemplif my invention; Fig. 2 a plan view thereo partly in section; and Fig. 3 a transverse section upon the broken line 3-3 of in the direction of the arrows. The same re erencesymbol is used throughp out the several views to designate each part.

be cast or othenwise shape and has mount- The 4 may formed in any desired rial which,

ed upon one end thereof a casting comprismg a colunm 5 and a pair of arms 6. The

latter are formed at their upper ends with are mounted bearing cavities in which blocks'igf of agate or other suitable mateas shown, are angularly concave upon their upper faces for the reception of the knives of the beam. Cover plates 8, 8 are applied to the upper ends of the arms to protect the bearings and knives. The scale beam comprises a horizontal rectangularfrnmc 9 which is preferably cast integral with a depending support or upright 10 to the lower end of which, is secured a bar 12 extending parallel to the frame. Knives 13, 13 for supporting the am upon the horns 6, 6 are embedded in the metal of frame 9 and extend on opposite sides thereof wherethey rest upon the bcarin blocks 7, 7 before mentioned, and

other, nives 14, 14 with upwardly directed verse plane through the center of the column for supporting the spider 15 which receives the scale pan 16. Said spider is cast with downwardly projecting legs 17 having sockets extending upwardly fi'om the lower ends thereof in which are mounted hearing blocks 18, which rest upon the knivcs14 before mentioned. Plates 19 close the lower ends of said sockets. A post or check rod 20 is cast or othenwise secured in the spider casting centrally thereof and projects down- .wardly therefrom through an axial opening in the top of the column 5 and is connected at its lower end by a link 21 with a post 22 secured to the base in unyjsuitablc manner.

a guide for the slidmountcd thereon and e bar 12 forms ing poise 23 which is carries a pair of uprights 24, 25 in w ich is'journaled the axle 26 ofya cylintends through and engages in a suitable manner the poise 23 for feeding the latter longittalinally of the harlZ. 'lhe axle 26 ot' the cqunputinp cylinder alul the shaft of the worm 29 extend through the upright 24 and each has keyed or pinned thereon agpar numbered res a'ctiretv 30- and 31 inthe drawing. the gear 51 upon 'the worm shaft being much smaller than that; upon the chart axle so that the worm is turned much more rapidly than the chart. Qhe axle of the chart beyond the gear 30 is extended through a bearing 32 in the frame 9 and carries a par 33 in the plane of the fulcrum knives 1 through the medium of which gear the c \'limlrieal chartis revolved and the. poise t'cd along: to counterlmlancing position. tlear 33 is in turn rerolved and its position controlled by a pair of racks 34. 35, which engage it upon diametrically opposite sides and are reciprocated by solenoids 36, 37 with thecorcs 38, 39 of which said racks are respectively directly connected. The bores of the solenoids are somewhat larger in diameter than .the cores so that the latter 'lit somewhat lot'a'sely therein. and the racks are .guided in vertical kcrfs or grooves 4". it in the frame 9 \vherelryfthey are prevented from binding on the. gear wheel notwithstamlin,, the slight rocking motion ircn to them 'by-tthe tiltingof the scale licam. t

The ele trical connections of the scale -a re shown diagrainmatically in Figs; 1 and :3 but it will he understood that in actual practice they are. for the most part concealed within the structure of the scale except in so in r as they must, he exposed to make connection with a source of current. The movena-nt of the beam is utilized to close contacls in the circuits of the respective solenoids when thos'calo is not in equilibrium. For thisptn-pose a post 42 is setit) cured at the end of the base remote from the column 5' and provided with a pair of brackets t3. H'whi'ch are insulated in any suitable mariner from thepost and carry adjustable contact; screws 413,-- 46.j The tip ofthe bar I: extends hetween'thc brackets and carries'contacts 47. 48 adapted to touch the contact screws 45, .46 respectively. Contact screw to and bracket. 43 are-connta-ted,

as shown more particularly in Fig; 1, by wire I" with solenoid 36, and contact screw -lt' and bracket 44 are similarly connected by wire with solenoid 37, A source of current n-prcscnted in thefnsual way at 51 is connected on the, one haml.;by a branched conductor 5:! to the solenoids and on the other ltulnl to the base of the scalewhcre it is gl'ounded'at 53.

The operation of the scale will now be apparent. When the lkllll'l is in equilibrium, as for example. when there is nothing in the. scale pan, the bar-12 will occupy the intermediate position shown in Fig. 1 with its contacts out of touch with either of the stationary contacts 45 or to. If now a load he placed in the scale pan the bar 12 will rise to close a circuikthrough the contact 45 and the solenoid :tttthrough the conuiectioiis just. described including the metal of the scale. and the wires 49 and 52. The contacts 46 and to being out of touch, there will. of course, he no current through solenoid 37 and hence it will not attract its armature. The energization of solenoid 36, however, will cause its core to draw down the rack M which will thereupon revol e the gear 33. the cylindrical chart and the worm shaft. thereby feeding: the poise 23 outward, So long as the bar 122 is inits upper position with the contacts 47 and to in touchthis action will continue. The wise will finally reach a point where it res tores equilibrium to the beam and if it is not fed beyond this point the bar 122 will drop to the intermediate position when the weight and priceof the commodity may be read upon the cylindrical chart. If. however, the poise is overthrown by the momentum of the parts so that the bar 1'. drops to close the lower pair of contacts. then a circuit is closed through the other solenoid, the path thereof being: traced from the battery through the structure of the scale including beam 12, to screw 46, bracket 44. wire 50. solenoid 37 and wire 512. .\s soon as the bar 12 breaks the circuit through the upper pair of contacts the solenoid 3 is dei ncrgized and when the circuit. is closed through tln solenoid t? asabove dcscribul. it opera es to draw down its core and tie rack attached thereto and rcyolve. the gear 33, the cylindrical chart and the worm shaft to move the poise Z3 inward or in a reverse direction to that in which it was first. fed. Thus as the beam closes the. upper and lower contacts successively the poise is. fed back and 'forth until .it reaches a point where true equilibrimn is established and the weight of the load in the scale pan may beread upon the I cylinder. \Vhen the load is removed from the sale pan of course the lower'contacts are cl )sed and the poise ted inward until it \reaches the zero position. At 54 I have illustrated the usual adjust-able poise for sealing thescale. The above described scale simple in construction and operation and. imposes no unnecessary burden upon the knife edges of the beam. a

I claim: I r 1. Ina. weighing scale, a base, a beam, a load receiver connected to the beam, a poise adjustable longitudinally of the beam, 'an' electrically actuated prime mover mounted on the base, a gear in the plane v of the fulcrum of the beam, and connections tlwretrom to the prime mover and to the poise .for moving the latter.

2. In a weighing scale, a base, a beam,

2. load receiver connected to the beam, a

fulcrumed on the base, a poise movable longitudinally of the beam, a gear mounted on the beam and connections to the poise for reciprocating the same, racks on opthe beam in the plane of its fulcrum, means,

for transmitting motion from the prime mover to the gear, and means for transmitting motion from the gear to the poise.

3. In a weighing scale, a base, a beam fulcrumed thereon, a load receiver connected to the beam, a poise ad'ustably mounted on the beam, an electricall actuated prime movermounted on the base, a rack driven by the prime mover, a gear mounted on the beam, and directly engaging said rack, and connections from the gear to the poise for moving the latter.

4. In a weighing scale, a base, a. beam fulcrumed thereon, a load receiver connected to the beam, a poise adjustably mounted on the beam, a pair of prime movers mounted on the base, a pair of racks driven by the prime movers, a gear mounted on the beam,

' and cotiperating with said racks, and connections from the gear to the poise for moving the latter.

5. In a weighing scale, a base, abeam 'fulcrumed thereon, a poise adjustable longitions therefrom to the poise for moving the latter, a rack meshing with said gear, and electromagnetic means arranged. to move said rack.

6. In a weighing scale, a base, a beam fulcrumed on the base, a poise adjustable longitudinally of the beam, :1 gear mounted on the beam and connections to the poise for operating the same from the gear, a pair of racks engaging the gear for operating it in opposite directions, and a pair of electromagnetic means mounted on the base and operating the'respective racks.

In a weighing scale, a base,-a beam fulcrumed on the base, a. poise adjustable longitudinally of the beam, a gear mounted on the beam and connections to the poise for operating the same from the gear, a pair of racks engaging. the gear for operating it in opposite directions, a pairof e]ect romagnetic means mounted on the base and operating the respective racks, and circuits adapted to be closed thevmoveme nt' t."

the beam to complete the. circuit .s through the respective electromagneticmeans.

8. In a. weighing'scale, a base, a beam fulcrumed thereon, a poise movable longitudinally of the beam, a pair of solenoids mounted on the base and arranged as parts of separate circuits, means controlled by the position of the beam for closing either of the circuits through the solenoids, and means controlled by the solenoids for operating the poise;

9. In a weighing scale, a base, a. beam 'tudinally'of the beam, a gear and connec- 'posite sides of the gear for operating the same, circuits including a pair of-solenoids, the cores of which solenoids" are connected to the respective racks, and contacts in said circuits adapted to be closed by the beam in its upper and lower positions respectively.

10. In a weighing scale, a beam ful-" crumed on the base and carrying a load receiver; apoise movable longitudinally of the beam, a rotary chart alsd' mounted on the beam, caring connecting the chart and poise or operating the same in unison, and means for operating the gearing including driving means arranged in the plane of the fulcrum of the beam.

11. In a weighing scale, a base, a beam fulcrumed on the base, a poise adjustable longitudinally of the beam, a worm shaft for 4 adjusting the poise, a rotary chart mounted on the beam, gearing between the rotary chart and worm, a gear mounted on the shaft of the rotary chart, and arranged in the plane of the fulcrum of the beam and means mounted on the base for rotating i the gear.

12. In a weighing scale, a basc,a beam fulcrumed on the base, a poise adj ustable longitudinally ofthe beam, means oh the beam for adjusting the poise, electromagnetic means mounted on the base out of horizontal alinementwith the beam for actuatingthe poise adjusting means, upper' and lower contacts mounted on the base, contacts on the beam adapted to coiiperate therewith, and connections from said contacts through the electromagnetic means whereby the position of the beam controls the circuit through the electromagnetic means, andthe means f0I1'30 crating the poise. fulcrumed on t receiver, a poise movable longi the beam, a prime moverarran e base and carryisg alloadi n ma y 'o transversely of the (beam in vertical alinement with the fulcrum and mounted on the base,

and connections between the prime mover.

and the poise for inovin'g the latter.

14. In {weighmg scale, a base, a beam V fulcrum'ed on the base and carrying a loadret-e1ver,a.poise movable longitudinally of the beam,e lectrom agnetic means arranged transversely of the-beam-and mounted on the base, and connections betweenthe electro magnetic means and thepoise formoving the latter. I s

15. In a weighing scale, a base, a beam fulcrumed on the base and carryinga loadreceiver, a poise movable longitu'dinlly of the beam, a pairof; vertically-disposed electromagnetic means arranged in planes on opposite sides of said beam, and connec- 51, rack driven by said motor, a screw engagmg the muse, and a pmlon on the screw driven by snld rack.

SAMUEL G. CRANE. Witnesses:

H. H. 130mm, C. W. FESSENDENV. 

